Method for the manufacture of a screen for a television apparatus or the like



July 7, 1953 M. AUPHAN 2,644,208

METHOD FOR THE MANUFACTURE OF A SCREEN v FOR A TELEVISION APPARATUS ORTHE LIKE Filed June 6, 1950 2 Sheets-Sheet l 3 .a 0^@ @EN LWW/ ffy# wwwJuly 7, 1953 E M.'AUPHAN E 2,544,208

METHOD FoR THE` MANUEACTURE oE A SCREEN EoR A TELEVISION APPARATUS oRTHE LIKE Filed June 6, 1950 2 Sheets-Sheet 2 Patented July 7, 19.53

METHOD FOR vTHF MANUFACTURE OF A SCREEN FOB A TELEVISION APPARATUS GB,THE LIKE Michel Auphan, Paris, France, assigner to Societe of MonacoGenerale dElectrenique, Monaco, Principalty Application June 6, 1950,Serial No.. 166,414 lin France June 11, 1949 Certain devices, for theprojection of television images comprise a plate or screen intended toaord a convenient modulating of the light issued from an auxiliarysource. Such a device is described, in particular, in my copendingapplication Serial No. 176,355, ledJuly 28, 1950.

The object of the present invention is a method for the preparation oisuch a plate or screen for any apparatus of that type or of any otherkind where it can be needed, said method, consisting in setting upon theplate a network of line wires or threads as parallel and equidistant aspossible, evaporating a suitable intermediate substance on to saidplate, removing the threads or wires, setting again a similar network inany other suitable direction, evaporating any suitable substance on tothe plate, removing such second network of wires or threads and removingthe intermediate substance.

I will now describe the method according to my invention with referenceto the accompanying drawings wherein Figures l, 2, 3, 4, 5, 6 and 'ishow, schematically the successive stages in the preparation of such aplate.

The supporting plate l having been covered or not with any kind ofcoating 2, for instance an insulating coating, by any suitable means,(anode oxidation, evaporation in a vacuum, electrophoresis), parallellaments or strands of ne wire are arranged on the plate, the strandsbeing spaced according to the dimensions to be given to the elementalsurfaces. These strands may be arranged on the plate I by winding themVpossible with the plate, parallel together, and,

equidistant. These Wires will be, for instance,

h1 such a case,

shows, at 4., the deposits thus obtained. The

direction of evaporation is shown by the arrows 5.

The wire is then unwound and the evaporated substance remains, instrips, as shown on Figure 3, denoted by reference numeral 6.,

After the wire has been arranged in a second direction, different fromthe rst one and with the same conditions of parallelism andequidistance, the selected metal is evaporated to constitute the desiredelemental surfaces. Here again, this may be eliected by winding the wireor applying the above-mentioned grating or any other element in a newand adequate direction. Figure 4 illustrates this stage. It shows themetal depositedat l, the VWires and the direction of evaporation shownat 9.

If the wire is then withdrawn, and if the evaporated substance isAdestroyed by any suitable means, (dissolution, evaporation), thedesired plate is constituted. It is thus necessary to utilize, as anintermediate substance, a substance which can be destroyed withoutaffecting the plate, its insulating layer or other eventual layers, orfacets, elemental surfaces,:tapes or the like, which Vit is desired toobtain. ByA way of example, paraffin, waxor a salt, etc. may be.

. eter of the order of 20 microns, which is arsilk, nylon or any otherkind of wires or threads,

of metal for instance, with a diameter of the order of 20' microns orany other suitable dimens1on.

To obtain elemental squares, a rectangular plate will be used,preferably, keeping the parallel wires on one of the sides.

Figure l is a partial diagrammatic section, showing the wires 3 arrangedin this manner.

Then a suitable substance is evaporated under a vacuum on to the surfaceof the plate thus wound, with a suitable direction of evaporation withrespect to the plate and wires. Figure 2 ranged so as to have one threadevery y microns. Parain is evaporated in a direction perpendicular tothe threads, and at 45 with respect to the normal to the'plane of theplate; and this to a thickness of the order of 1.5 microns of paraffin.This obliqueness is not necessary, it simply has the advantage of makingone of the edges of the first layer evaporated sharper than the otherone.

Figure 6, appended to illustrate this point, shows that the shadow isprojected on the edge Il of layer I5 from one point A of the thread I4,closer to the plate than point B whence the shadow is cast on the edgeI3. The result is that the edge II of the layer I5 is sharper than itsedge I3.

If it is desired to manufacture a fairly large plate, however, Yitmay.be of interest to sacrice this advantage to the necessity of obtainingstrips of a uniform thickness, especially if a chamber large enough t0place the evaporator sufficiently far from the plate is not available.The plate is then placed perpendicularlyto the direction `ofevaporation.

After they have been removed, the threads vor wires are again arranged,lfor instance with the same spacing and in afperpendculai" direction (byrotating the grating by 90 parallel to its plane).

The metal evaporation is continued to the required thickness in the samedirection as l the rst one, this direction being n ow 45 with respect tothe direction of the wiresor threads. The wires orthreads'are thenremoved' and theparain is evaporated by heating -under a 'reducedpressure.

It vis obvious that the invention is not limited tothe applicationsoffered by pat'ent application Serial No. 176,355, filed July 28, 1950',and that any .other application of its principle andcharacteristics'iswithin its'scope In particular, the second evaporationvmay be eected perpendicularlyto the plate or in any other suitabledirection. This allows the obtention'of 'plates with structures slightlyydifierent fromthat described in the said patent;V for instance, ifthe'evaporation is effected normally to the plate, the squares,rectangles or other elements will not be detached anda series ofcorrugated parallel tapes are obtained as shown schematically in Figure'7.

All directionso'f evaporation with respect to the' plate or threads arethus within the scope of the'inventionthechoice to be made dependingonlyon' the" application contemplated.

The'components used, plate, support, intermediate substancesfmetalmosaic', are not within 'thescope' or the invention, which remainsapplicable with theV most varied substances.l Similarly, plate I *is notnecessarily a conducting plate or a plate covered with an insulatinglayer. Numerous' applications may be contemplated in which it is quitedifferently constituted; It may be, for instance, entirely insulating orentirely conducting. "It may' thus be said that the manufacturingmetho'd'applies toany part having a plane face:

The invention extends, by way of new industriai" productsto platesmanufactured in this manner.-

What is claimed is: f

1. A method for manufacturing plates for television apparatus Aand thelike, comprising the steps' of covering a plate With a set ofsubstantially parallel and Vequidistant spaced iilaments; depositing onsaid plate a non-metallic substance Iby dissolving the" same.

so as to form intermediate said laments nonmetallic solid strips eachbeing in contact with at least one of said filaments so as at leastpartly to ill the spaces between said filaments, said non-metallic solidstrips being transformable into a ;luid condition; removiingsaidfilaments from said' platel so as-to leave said deposits of saidnon-metallic solid separated from one another vby spaces at least partof which was occupied by said filaments; placing on said deposits ofsaid non.-rnetallicV solid a set of substantially parallel andequ'idistant spaced filaments extending in a direction` different fromthat of said rst-mentiohed rllamentsj depositing a metallic substance onthearea'siof' said plate and said deposits of said non-metallic usolidbetween said secondmentioned Afilarrlents so as to form metallicelements having a vbase end portion adhering to said plate and a raisedend portion being substantially parallel to said plate and separatedfrom said plate by a distance substantially corresponding tothethickness of said deposits of said non-metallic solid; removing saidseconde' mentioned r"filaments from. said deposits of said non-metallicsolid; and .removing said deposits of said'non-m'etallic solid bytransforming the same into the iiuid condition thereof.

2f A method according to claim 1 in which the laments are woundA aroundthe plate and the non-metallic substancey isV deposited on one side ofsaid plate.

3'.V A method according to claim l in which the set of substantiallyparallel and equidistant spaced laments covering the plate consists of aj prefabricate'd grid.

4. A'method according to claim l in which said deposits of saidnon-metallic solid are removed by evaporating the same.

5. A 'method according to claim 1 in which said deposits of saidnon-.metallic solid are removed MICHEL AUPHAN.

liste-liesse Gite@ is, the le of this paient SEMES PATENTS Number vNameDate 2,139,640 Mall et al. Dec. 6, 1938. 2,243,237 Whiley May 27, 1941.2,362,507

Steinbock etal. Nov. 14, 1944

